How do u study in Engineering

Hey guy how do u study Engineering? I have classes all day and when I return home I'm so tired that I take a long nap and then realize I have work I start working at 6 pm and work till 12. I also scroll on TikTok for an hour because I can't sleep and I get less sleep and the cycle repeats repeatedly. I want to lock in and improve my study and work habits. Please help me guys!!